Upon a write error, @command{yes} exits with status @samp{1}.
The only options are a lone @option{--help} or @option{--version}.
+To output an argument that begins with
+@samp{-}, precede it with @option{--}, e.g., @samp{yes -- --help}.
@xref{Common options}.
@dfn{failure}. It can be used as a place holder in shell scripts
where an unsuccessful command is needed.
-@vindex POSIXLY_CORRECT
-By default, @command{false} honors the @option{--help} and @option{--version}
-options. However, that is contrary to @acronym{POSIX}, so when the environment
-variable @env{POSIXLY_CORRECT} is set, @command{false} ignores @emph{all}
-command line arguments, including @option{--help} and @option{--version}.
+@command{false} honors the @option{--help} and @option{--version} options.
This version of @command{false} is implemented as a C program, and is thus
more secure and faster than a shell script implementation, and may safely
you use @samp{true} in a script, you're probably using the built-in
command, not the one documented here.
-@vindex POSIXLY_CORRECT
-By default, @command{true} honors the @option{--help} and @option{--version}
-options. However, that is contrary to @acronym{POSIX}, so when the environment
-variable @env{POSIXLY_CORRECT} is set, @command{true} ignores @emph{all}
-command line arguments, including @option{--help} and @option{--version}.
+@command{true} honors the @option{--help} and @option{--version} options.
Note, however, that it is possible to cause @command{true}
to exit with nonzero status: when invoked in non-@acronym{POSIX} mode,